fix(scm): accept body-file for PR reviews

[aaight]

Summary

Fixes the CreatePRReview CLI/docs mismatch by adding a declarative --body-file file input alternative for the required review body.

Card: https://trello.com/c/6a008f3d72d70bdc602b1c94

Changes

• Added body-file metadata to createPRReviewDef without changing shared CLI or manifest infrastructure.
• Extended definition, generated native-tool guidance, and real oclif parsing tests for CreatePRReview --body-file.
• Updated gadget docs and changelog to document --body-file <path> and --body-file -.

Testing

• npx vitest run --project unit-core tests/unit/gadgets/github/definitions.test.ts tests/unit/cli/file-input-flags.test.ts tests/unit/backends/shared-nativeToolPrompts.test.ts
• npx vitest run --project unit-backends tests/unit/backends/shared-nativeToolPrompts.test.ts
• npm run lint:fix
• npm run lint
• npm run typecheck
• npm run build
• `node bin/cascade-tools.js scm create-pr-review --help | rg -- '--body-file|--comments-file|Read review body'

Notes

npm run lint exits 0 but reports seven pre-existing warnings in unrelated files; this PR leaves them untouched.

🕵️ codex · gpt-5.5 · run details

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[nhopeatall]

LGTM - The metadata-only change follows the existing file-input pattern, preserves comments parsing, and the focused definition/CLI/prompt tests pass.

🕵️ codex · gpt-5.5 · run details